The use of the GIS Kriging technique to determine the spatial changes of natural radionuclide concentrations in soil and forest cover.

Turgay Dindaroğlu

doi:10.1186/s40201-014-0130-6

Abstract

BackgroundThe distribution of radionuclides occurring naturally in the earth depends on bedrock characteristics. Therefore, the spatial distribution of radionuclides is not uniform. Consequently, radionuclide information is vitally important in determining and monitoring the spatial variation of the radionuclide concentrations that are over the limits for the sustainable environment and human health.MethodsThis research was carried out using GIS methods and geostatistical analysis as Kriging techniques to reveal the spatial variation of the 226Ra, 232Th and 40 K concentrations of natural radionuclides in the Çoruh and Aras Basin. The spatial variations of the detected radionuclides were correlated with soil groups and forest cover.ResultsIn the study area, 43.17% of the concentration of 40 K, 26.67% of the concentration of 226Ra and 28.16% of the 232Th concentration was determined to be over the average limits. Concentrations of radionuclides that are over the average limits have been found to be on basalt and chestnut soils. Brown and reddish brown soils have a low concentration of the spatial distribution of the radionuclides. Statistically positive correlations were detected (0.865 **) between the 226Ra and 232Th. In addition, a positive relationship between forest cover and 226Ra and a negative relationship between 232Th and 40 K were identified.ConclusionsExcessive exposure to radiation may cause cancer and hereditary diseases. Ecological environments include the soil and the plants. Hence, the periodical monitoring of the spatial variation in concentrations of radionuclides is very important for the health of future generations.

Highlights

The distribution of radionuclides occurring naturally in the earth depends on bedrock characteristics
The natural radionuclide concentrations are above the established limits according to Correspondence: turgaydindaroglu@hotmail.com Faculty of Forestry, Department of Forest Engineering, Kahramanmaras Sutcu imam University, 46100 Kahramanmaras, Turkey
Over time, the infiltration of radionuclides has resulted in high radionuclide concentrations in the lower soil layers

Summary

Introduction

The distribution of radionuclides occurring naturally in the earth depends on bedrock characteristics. The spatial distribution of radionuclides is not uniform. Radionuclide information is vitally important in determining and monitoring the spatial variation of the radionuclide concentrations that are over the limits for the sustainable environment and human health. High concentrations of natural radionuclides are found in volcanic, phosphate, granite and salt rock. Rocks increase the natural radioactivity of the soil. The natural radionuclide concentrations are above the established limits according to UNSCEAR. If the concentration of natural radioactive elements goes over the average limits, there can be negative effects on human health [3]. The spatial distribution of the concentrations of natural radionuclides in the soil has to be determined. It is possible to use CBS and geostatistical analysis to obtain these values

Methods

Results

Conclusion